Cross laminated timber combining fast growing timber material characteristics and meeting building structure requirements and preparation method thereof

A building structure and glulam technology, applied in the field of cross-laminated wood, cross-laminated wood and its preparation, can solve the problems of reduced mechanical properties of components, weakened fire resistance, and high manufacturing costs, and achieves low processing loss and mechanical properties. And the effect of improving fire resistance and strong dimensional stability of components

Pending Publication Date: 2019-03-08
NANJING UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0011] For the existing cross-laminated timber, the process of internal wood slotting and gaps between the standard timbers is used to reduce its internal stress and cracking deformation, which brings about the problems of reduced mechanical properties of components and weakened fire resistance, and the existing The production technology is too high for the production cost of conventional structural dimension lumber cross-laminated timber components

Method used

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  • Cross laminated timber combining fast growing timber material characteristics and meeting building structure requirements and preparation method thereof
  • Cross laminated timber combining fast growing timber material characteristics and meeting building structure requirements and preparation method thereof
  • Cross laminated timber combining fast growing timber material characteristics and meeting building structure requirements and preparation method thereof

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preparation example Construction

[0061] A preparation method of cross-glued wood, specifically comprising the following steps:

[0062] S1. Laminate preparation process: choose an initial moisture content of not less than 50%, and a corresponding air-dry density of 0.3g / cm 3 ~0.45g / cm 3 The fast-growing wood is rotary cut into fast-growing wood laminates with a thickness of 8mm to 15mm;

[0063] S2. Laminate drying process: reduce the moisture content of the fast-growing wood laminate to 8% to 15% by drying;

[0064] S3. Plywood gluing process: use one-component polyurethane, or melamine-urea-formaldehyde resin, or resorcinol-phenolic resin and other structural adhesives to coat the surface of the plywood to be glued, and the sizing amount is 200g / m 2 ~500g / m 2 ;

[0065] S4. Cross-glued wood laminate assembly: According to the regulations on the size and stress state of the cross-glued wood final product, arrange the texture assembly of several layers of laminates;

[0066] S5. Cross-glued wood pressing...

Embodiment 1

[0072] Such as figure 2 As shown, for the cross-glued timber that combines the material characteristics of fast-growing wood and the requirements of the building structure, all layers of the components are made of fast-growing wood laminates, and the density of the fast-growing wood used is 0.45g / cm 3 , the thickness of the rotary cut layer is 8mm. During the pressurization process of the billet assembly, the pressure is taken as the pressure value corresponding to the total compression ratio of the fast-growing material from the thickness to 6.67%, and the microwave-assisted heating method is used to make the internal temperature of the component reach 50 ℃~60℃.

[0073] The cross-glued timber member with a length × width × thickness of 4444mm × 1000mm × 225mm (volume 1.0m 3 ) for comparison, the blank assembly is shown as figure 1 As shown, that is, the adjacent layers composed of gauge lumber 1 for the outermost layer structure and gauge lumber 2 for the inner layer stru...

Embodiment 2

[0076] Such as figure 2 As shown, for the cross-glued timber that combines the material characteristics of fast-growing wood and the requirements of the building structure, all layers of the components are made of fast-growing wood laminates, and the density of the fast-growing wood used is 0.30g / cm 3 , the thickness of the rotary-cut laminate is 15mm. During the pressurization process of the blank assembly, the pressure is taken as the pressure value corresponding to the total compression rate of the fast-growing wood laminate thickness reaching 13.33%, and the pressing is completed at room temperature.

[0077] The cross-glued timber member with a length × width × thickness of 4444mm × 1000mm × 225mm (volume 1.0m 3 ) as an example, taking the standard timber with a thickness of 38mm and a length of not less than 3050mm as an example, the cost of timber is 2500÷60%=4167 yuan / m 3 , the adhesive cost is 6×0.35×60×4.444×(1+10%)=616 yuan / m 3 , the total material cost is 4783 y...

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Abstract

The invention discloses cross laminated timber combining fast growing timber material characteristics and meeting building structure requirements and a preparation method thereof, and belongs to the field of timber structures. A laminated board of the cross laminated timber comprises a fast growing timber laminated board with cracks, the fast growing timber laminated board is a whole cracked board, and lengths of all laminated boards of the cross laminated timber are consistent in the horizontal direction. In the preparation method, adjacent layers formed by the fast growing timber laminated board or fast growing timber laminated board combination are assembled and configured in a manner that wood textures are perpendicular to each other in the thickness direction of laminated wood. According to the cross laminated timber combining the fast growing timber material characteristics and meeting the building structure requirements and the preparation method thereof, the material characteristics that the fast growing timber is soft in material and prone to be made into the laminated board with the cracks in a rotary cutting mode are fully utilized, structural stock lumber is replaced for preparing the cross laminated timber, the utilization of the fast growing timber in the field of building structures is expanded, the material cost of a conventional component is greatly reduced, the component preparation process is simplified, the production period is shortened, and the problem that adverse effects on the mechanical property, durability and fireproof performance of the component are caused through gaps in laminated boards of a structural material cross laminated timber component is solved.

Description

technical field [0001] The invention belongs to the field of wood structures, and specifically relates to cross-glued wood; more specifically, it relates to cross-glued wood which combines the material characteristics of fast-growing materials and building structure requirements and a preparation method thereof. Background technique [0002] Orthogonal glued wood board is a solid board with large size and excellent bidirectional mechanical properties formed by the cross-lamination of wood boards of certain specifications through adjacent layers, and through the bonding of structural adhesives. It is often used as walls, floors and Main load-bearing components such as roofs. Its largest size abroad (Europe) has reached 2.95m×16.0m×0.32m (width×length×thickness), and the largest domestic size has reached 3.50m×24.0m×0.50m (width×length×thickness). [0003] Wood has the natural characteristic of shrinking or expanding as environmental conditions (especially environmental humid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/08B32B21/02B32B21/13B32B7/12B32B37/12B32B37/10B32B37/06
CPCB27D1/04B27D1/08B32B7/12B32B21/02B32B21/13B32B37/06B32B37/10B32B37/12B32B2307/734B32B2307/50B32B2307/3065
Inventor 岳孔王然焦学凯刘伟庆陆伟东
Owner NANJING UNIV OF TECH
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